NEC NL6448BC20-08 Datasheet

DATA SHEET

TFT COLOR LCD MODULE

NL6448BC20-08

17 cm (6.5 type), 640

××××

480 pixels 262144 colors,

high luminance, wide viewing angle

DESCRIPTION

NL6448BC20-08 is a TFT (thin film transistor) active matrix color liquid crystal display (LCD) comprising
amorphous silicon TFT attached to each signal electrode, a driving circuit and a backlight. NL6448BC20-08 has a
built-in backlight. Backlight includes long-life lamps and the lamps are replaceable.

The 17 cm diagonal display area contains 640 × 480 pixels and can display 262144 colors simultaneously.

NL6448BC20-08 is suitable for industrial application use, because the luminance is high, and the viewing
direction is selectable with display scan select.

FEATURES

• High luminance (300 cd/m2, typ.)

• Low reflection

• Wide viewing angle with retardation film (Antiglare treatment)

• Display reverse scan function

• 6-bit digital RGB signals

• Edge type backlight with long-life-lamps (Two lamp holders, inverter-less)

• Variable luminance control

• Recommended inverter (Part No. 65PWB31)

• Compatible to the mounting holes position of NL6448AC20-06 except for inverter.

APPLICATIONS

• Measuring instruments

• Display terminals for control system

• Monitors for process controller

Document No. EN0442EJ1V0DS00 (1st edition)
Date Published July 1999 P
Printed in Japan

1999©

NL6448BC20-08

STRUCTURE AND FUNCTIONS

A color TFT (thin film transistor) LCD module is comprised of a TFT liquid crystal panel structure. LSIs for driving
the TFT array, and a backlight assembly. The TFT panel structure is created by sandwiching liquid crystal material
in the narrow gap between a TFT array glass substrate and a color filter glass substrate. After the driver LSIs are
connected to the panel, the backlight assembly is attached to the backside of the panel.

RGB (red, green, blue) data signals from a source system is modulated into a form suitable for active matrix
addressing by the onboard signal processor and sent to the driver LSIs which in turn addresses the individual TFT
cells.

Acting as an electro-optical switch, each TFT cell regulates light transmission from the backlight assembly when
activated by the data source. By regulating the amount of light passing through the array of red, green, and blue
dots, color images are created with clarity.

2

Data Sheet EN0442EJ1V0DS00

BLOCK DIAGRAM

100 Ω

R0-R5

100 Ω

G0-G5

100 Ω

B0-B5

47 Ω

CLK

100 Ω

H sync

100 Ω

V sync

Digital
signal
processor

LCD timing
controller

Level
shift

·

·

·

·

V-driver

·

· · · · · ·

TFT LCD panel

H: 640 × 3 (R, G, B)
V: 480

480 lines

NL6448BC20-08

H-driver

1920 lines

DE
DPS

V

CC

GND (SG)

Frame (FG)

V

CC

47 kΩ

100 Ω

47 kΩ

Power
supply
circuit

LSIs (VCCi: 3.3 V)

Drivers

Data Sheet EN0442EJ1V0DS00

3

(1) In case of use NEC recommended inverter

InverterVDDB

BRTL
BRTH
GNDB

(2) In case of use the inverter of customers

VH
VL

NL6448BC20-08

Backlight

(Part No. 65PWB31)

Lamp

VL
VH

Lamp

Backlight

OUTLINE OF CHARACTERISTICS (at room temperature)

Display area 132.48 (H) × 99.36 (V) mm

Drive system a-Si TFT active matrix

Display colors 262144

Number of pixels 640 × 480

Pixel arrangement RGB vertical stripe

Pixel pitch 0.207 (H) × 0.207 (V) mm

Module size 178.8 (H) × 126.8 (V) × 11.0 typ. (D) mm

Weight 240 g (typ.)

Contrast ratio 250:1 (typ.)

Viewing angle (more than the contrast ratio of 10:1)

• Horizontal: 50° (typ. left side, right side)

• Vertical : 35° (typ. up side), 45° (typ. down side)

Designed viewing direction

• wider viewing angle with contrast ratio : up side (12 o’clock, reverse scan)
: down side (6 o’clock, normal scan)

• wider viewing angle without image reversal: up side (12 o’clock, normal scan)
: down side (6 o’clock, reverse scan)

Palarizer pencil-hardness 2H (min. at JIS K5400)
Color gamut 42% (typ. center to NTSC)
Response time 16 ms (typ.) “white” to “black”

2

Luminance 300 cd/m

(typ.)

Signal system 6-bit digital signals for each of RGB primary colors,

Synchronous signals (Hsync, Vsyc), Dot clock (CLK)
Supply voltage 5.0 V (3.3 V) (Logic, LCD driving)
Backlight Edge light type: two fluorescent lamps (cold cathode type)

2

Power consumption 5.0 W (typ., at 300 cd/m

, not include inverter less)

4

Data Sheet EN0442EJ1V0DS00

NL6448BC20-08

GENERAL SPECIFICATIONS

Item Specifications Unit
Module size 178.8 ± 0.5 (H) × 126.8 ± 0.5 (V) × 11.5 max. (D) mm
Display area 132.48 (H) × 99.36 (V) mm
Number of pixels 640 (H) × 480 (V) pixel
Dot pitch 0.069 (H) × 0.207 (V) mm
Pixel pitch 0.207 (H) × 0.207 (V) mm
Pixel arrangement RGB (Red, Green, Blue) vertical stripe
Display colors 262144 color
Weight 260 (max.) g

ABSOLUTE MAXIMUM RATINGS

Parameter Symbol Rating Unit Remarks

−

CC

Supply voltage

Input voltage V
Lamp voltage V
Storage temp. T
Operating remp. T
Humidity

V
V

RH

DD

I

L

ST

OP

(no condensation)

measured at the display area

Note

ELECTRICAL CHARACTERISTICS

(1) Logic, LCD driving

Parameters Symbols Min. Typ. Max. Unit. Remarks

Supply voltage V

Logic input “L” voltage V
Logic input “H” voltage V
Supply current I

−

0.3 to 6.5 V

−

0.3 to 6.5 V

−

0.3 to V

CC

+ 0.3 V

1600 V

−

25 to 70
0 to 60

≤

95% relative humidity Ta ≤ 40°C

≤

85% relative humidity 40 < Ta ≤ 50°C

Absolute humidity shall not exceed
Ta = 50°C, 85% relative humidity level.

CC

IL

IH

CC

V

4.75
(3.0)

CCi

0
× 0.7

−

5.0

(3.3)

200

(320)

−

−

Note 1

V

5.25
(3.6)

CCi

(600)

× 0.3 V

CC

V
450

rms

°

C

°

C

V

V

mA V

Ta = 25°C

I

− VCC < 3.0

V

module surface

Ta > 50°C

CMOS level

CC

= 5.0 V

CC

= 3.3 V)

(V

−

−

Note

Ta = 25°C

−

Note 2

Notes 1.

Checker flag pattern (in EIAJ ED-2522)

CCi

= 3.3 V : V

V

2.

CCi

is given by DC/DC converter in the LCD module.

Data Sheet EN0442EJ1V0DS00

5

(2) Backlight

Parameters Symbols Min. Typ. Max. Unit. Remarks

NL6448BC20-08

Ta = 25°C

Lamp current I
Lamp voltage V
Lamp turn on voltage V

Oscillator frequency F

Recommended value of “F

Note

•Ft is within the specification.

and

1

Ft =

•

4th

× (2n – 1)

If Ft is out of the recommended value, interference between Ft frequency and Hsync frequency may cause
beat on the display.

SUPPLY VOLTAGE SEQUENCE

4.75 V (3.0 V) 4.75 V (3.0 V)

V

CC

0 V

t < 150 ms

L

L

S

t

t

”

2.0 5.0 6.0 mArms with one lamp

−

−−

−−

50 54 58 kHz

400

thn: Hsync period

: a natural number (1, 2, 3, ····)

0 < t < 35 ms 0 < t < 35 ms

−

720 Ta = 0°C
590

Vrms
Vrms

Ta = 25°C

Note

−

Signal

0 V

Power-on Power-off

The supply voltage for input signals should be the same as V

*1

Apply VDDB within the LCD operation period. When the backlight turns on before LCD operation or the LCD

*2

VALID

CC

.

operation turns off before the backlight turn off, the display may momentarily become white.
When the power is off, please keep whole signals (Hsync, Vsync, CLK, DE, and DATA) low level or high

*3

impedance.

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Data Sheet EN0442EJ1V0DS00

NL6448BC20-08

INTERFACE PIN CONNECTION

Module side connector Mating connector
CN31 ····· IL-310-T31PB-VF (No. 1 to 31) IL-310-T31S-VF
Supplier: Japan Aviation Electronics or

Industry Limited (JAE) DF9-31S-1V or DF9M-31S-1R

Supplier: HIROSE ELECTRIC CO., LTD

(1) 6-bit interface signals, power supply

Pin No. Symbols Func tion Pin No. Symbols Func tion

1 GND Ground 17 G4 Green data
2 CLK Dot clock 18 G5 Green data (MSB)
3 Hsync Horizontal synchronous 19 GND Ground
4 Vsync Vertic al sync hronous 20 B0 Blue data (LSB)
5 GND Ground 21 B1 Blue data
6 R0 Red data (LSB) 22 B2 Blue data
7 R1 Red data 23 B3 Blue data
8 R2 Red data 24 B4 Blue data

9 R3 Red data 25 B5 Blue data (MSB)
10 R4 Red data 26 GND Ground
11 R5 Red data (MSB) 27 DE Data enable
12 GND Ground 28 V
13 G0 Green data (LSB) 29 V
14 G1 Green data 30 N.C. Non-connection (Open)
15 G2 Green data 31 DPS Scan Direction select

CC

CC

Power supply
Power supply

16 G3 Green data

CC

: All VCC terminals should be connected to VCC.

Notes 1.

V
DPS: Normal scan is “L” or “Open”. And reverse scan is “H”.

2.

During the operation, do not change the operation mode: e.g. scan direction.

3.

LSB : Least Significant Bit
MSB: Most Significant Bit

Data Sheet EN0442EJ1V0DS00

7

NL6448BC20-08

(2) Inverter

<2-1> In case of use NEC recommended inverter

• Inverter side connector 1 Mating connector 1
CN1 ··· IL-Z-6PL-SMTY IL-Z-6S-S125C3

Supplier: Japan Aviation Electronics Industry Limited (JAE)

Pin No. Symbols Func tion Pin No. Symbols Func tion

1 GNDB Backli ght ground 4 VDDB Power supply
2 GNDB Backlight ground 5 BRTL Luminance control input
3V

• Inverter side connector 2 Mating connector 2 (Lamp side)
CN2 andCN3 ··· SM02 (8.0) B-BHS-TB BHR-03VS-1

Pin No. Symbols Func tion

1 VH High voltage terminal
2 N.C. Non-connection
3 GNDB Backli ght ground

DD

B Power supply 6 BRTH Lum i nance control input

Supplier: J.S.T TRADING COMPANY, LTD.

Notes 1.

A way of luminance control by a variable resistor

Mating variable resistor

BRTL BRTH

R

A way of luminance control by a voltage

2.

Minimum luminance (50%)
Maximum luminance (100%)

The range of input voltage between BRTH and GNDB is as follows.
Minimum luminance (50%) : 1.5 V
Maximum luminance (100%): 1.9 V

: 10 kΩ ±5%
: R = 0 Ω
: R = 10 kΩ

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Data Sheet EN0442EJ1V0DS00